Method for Production of Natural Rubber

Abstract

A method for producing a solid natural rubber by adding a compound having a quaternary ammonium ion and a carboxyl ion in the molecule thereof to a natural rubber latex and removing and drying a water content of the latex, whereby the increase in the viscosity during storage can be suppressed.

1 . A method for producing solid natural rubber comprising:
 adding a compound having a quaternary ammonium ion and a carboxyl ion in the molecule thereof to a natural rubber latex and;   removing and drying a water content of the latex.   
   
   
       2 . A method for producing natural rubber as claimed in  claim 1 , wherein said compound having a quaternary ammonium ion and a carboxyl ion is a compound having the formula (I): 
     
       
         
         
             
             
         
       
     
     wherein R 1 , R 2  and R 3  independently indicate an organic groups selected from C 1  to C 20  alkyl groups, C 6  to C 20  aryl groups and C 7  to C 20  aralkyl groups, may include an ester bond and/or an amide bond, and R 4  indicates a C 1  to C 12  alkylene group. 
   
   
       3 . A method for producing natural rubber as claimed in  claim 1 , wherein the addition amount of said compound having a quaternary ammonium ion and a carboxyl ion is 0.001 to 0.1 mol based upon 1.0 kg, in terms of the solid content, of the natural rubber latex. 
   
   
       4 . A method for producing natural rubber as claimed in  claim 1 , wherein the natural rubber latex is a field latex, a concentrated latex or the mixture thereof. 
   
   
       5 . A method for producing natural rubber as claimed in  claim 1 , characterized in that a water content of the natural rubber latex is dried by exposing the natural rubber latex to pulse shock waves to thereby dry off the water content. 
   
   
       6 . A natural rubber produced by a method as claimed in  claim 1 .